Annealing-furnace.



N0. 664,l73. Patented Dec. l8, I900.

a. w. PACKER.

ANNEALING FURNACE.

(Application filed July 26, 1900.) (No Model.) 2 Sheets-Shae! I.

Witnesses.-

"cams PEYERS ca, Pun'ro-u-mou wumucmx. u. c.

I Patented Dec. l8, I900. G. W, PACKER. ANNEALING FURNACE.

(Application filed July 26, 1900;)

2 Sheets-Sheet 2.

'No. 664,l73.

(No Model.)

have/Z597? Gabi/m4 M YHE NURRIS PETE! OD PHOTILLITHQ, WASHINGTON, Il v C.

UNITED TATES .ATENT FFICE.

GEORGE w. PAOKER, or oIIIcAeo, ILLINOIS.

ANNEALlNG-FURNACE.

SPECIFICATION forming part of Letters Patent No. 664,173, dated December 18, 1900.

Application filed July 26, 1900- Serial No. 24,869. (No model.)

To all whom it may concern.-

Be it known that I, GEORGE W. PACKER, acitizen of the United States, residing at Ohicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Annealing-Furnaces; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to an improvement in annealing-furnaces by means of which castings can be annealed and decarburized in a shorter time and with less expenditure of fuel than in those now in use; and it consists in the parts and combinations herein described and claimed.

Referring to the drawings forming a part of this specification, Figure 1 is a longitudi nal vertical section of my improved furnace on line w a; of Fig. 2, and Fig. 2 is a transverse section.

1, 2, 3, and 4 are the chambers or ovens of my improved furnace.

5 5 are cases containing the castings, packed in the usual manner with any suitable material.

6, 7, 8, and 9 are oil-burners.

10 10 are passages or fiues connecting the upper and lower chambers.

11 11 are fiues leading from the lower chambers to the stack.

12 12 are openings between the two upper chambers 1 and 2. 13 13 are similar openings between the two lowerchambers 3 and 4:. The openings 12 and 13 may be closed in any suitable manner, as by fire-bricks, when desired.

14 14 are the usual charging-doors for the several chambers.

In the operation of my furnace the chambers 1, 2, 3, and 4c are charged with the cases 5, containing the castings, and the burners 6 and 7 of the upper chambers are lighted. The amount of air admitted along with the oil through the burners 6 and 7 is so proportioned that the oil is not at once thoroughly atomized, and complete combustion does not take place in the upper chambers 1 and 2. The products of combustion, together with the unconsumed portion of the fuel, escape through passages or flues 1O 10 to the lower chambers 3 and 4, where the combustion is completed, the necessary air being supplied through burners 8 and 9 or in any other obvious manner. The products of combustion then pass from the lower chambers 3 and 4 through the fines 11 11 to the stack. If the openings 12 12 have been left open, the communication between the upper, chambers 1 and 2 will tend to equalize the temperature thereof. Similarly the openings 13 13 will act to equalize the temperature of thelower chambers 3 and 4.

To obtain the best results, it is necessary that the heat be supplied gradually to the castings in the annealing-furnace. Otherwise the castings near the walls of the cases 5 will be injuriously heated before the castings nearer the middle of the cases have been raised to a sufficient temperature. This result is obtained in the upper chambers of my furnace by the incomplete combustion of the fuel therein, while the completion of the combustion in the lower chambers supplies heat gradually and evenly to these chambers and also prevents the wasteful escape of any unconsumed fuel through the stack. The fuel is supplied to the burners 6 and '7 of the upper chambers until the castings in these chambers are raised to such temperature that they are unable to absorb any more heat. This is conveniently determined by examining the interior of the furnace through a peephole or by removing a brick from the furnacewall to permit such inspection. After the castings in the upper chambers have been raised to such temperatures the fuel is shut off from the burners 6 and 7. It will be found that the lower chambers 3 and 4 have been raised to a temperature somewhat below that of the upper chambers 1 and 2 by the fuel supplied through burners 6 and 7. The burners 8 and 9 in the lower chambers are now lighted and fuel supplied thereto until the castings in the lower chambers have been raised to the desired temperature, the products of combustion from said burners 8 and 9 escaping directly to the stack by way of fiues 11. When the castings in the lower chambers 3 and 4 have been raised to the required temperature, the burners8 and 9 are shut off and the furnace left to cool slowly, after which the castings are moved.

In a large furnace of this construction I have found it necessary to supply fuel to the burners in the upper chambers for only three days and then to the burners in the lower chambers for twenty-four hours longer.

While I have shown my furnace adapted to burn oil, it is obvious that any other fuel could be employed.

Having thus described my invention, what I claim is-- 1. In an annealing-furnace, the combination of an upper heating-chamber, a lower heatingchamber, separate charging means foreach chamber, independent means for supplying fuel and air to each of said chambers, fiues leading from the upper chamber to the lower chamber, and outlet-fines leading from said lower chamber.

2. In an annealing-furnace, an upper heating-chamber, a lower heating-chamber, independent means for supplying fuel and air to the upper part of each of said chambers, fiues leading from the lower part of said upper the said ovens, flues leading from each of said chambers of the upper series to one of said chambers of said lower series,and escape-hues in each of said lower ovens.

In testimony whereof I aifix my signature in presence of two witnesses.

GEORGE W. PAOKER.

Witnesses:

ARTHUR JOHNSON, ALFRED GEO. FOSTER. 

